Adjustable angle attachment for dental handpieces



(Moaei.)

G. 'L. FURMAN 8a G. E. HOLLAND. ADJUSTABLE ANGLE ATTACHMENT EOE DENTALEANE PIECES.

No. 513,178. Patented Jan. 23, 1894.

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UNITED STATES PATENT OFFICE.

'CI-TABLES. L. FURMAN AND GEORGE E. HOLLAND, OF FEORIA, ILLINOIS.

ADJUSTABLE ANGLE ATTACHMENT FOR DENTAL HANDPIECES.

SPECIFICATION forming part of Letters Patent No. 513,178, dated January23, 1894.

Application led September 8, 1890. Serial No.364,289. (Model.)

' a new and useful Adjustable Angular Dental- Engine Handpiece, of whichthe following is a specification.

Ourl invention relates to an improved den-I talenginehandpiece, in whicha rotating head, at the extremity of the said handpiece,`

said head carrying the rotating drill or burr, enables the operatorcontrolling the same to reach any angle in drilling, and also to drillistraight with one and th'e samehandpiece,y and the same drill or burr,without yremoving the same from the engine, making it' possible to usethisimproved handpiece for the old' style straight hand-piece, and alsofor the various .dierent angular hand-pieces nowv in, common use, thusdispensing with several' tools. It is also noticeable that, with ourim-` proved handpieee, the drill may be operated at vany angle with thedriving shaft by simply adjusting it to the desired angle, and releasingthe pushbar or bolt for that purpose, by this means retaining it in anydesired posi-j tion, and thus enabling the operator to reach cavitiesand surfaces out of the reach of any one of the appliances now in use,thus saving valuable time, that would otherwise be spent handpiece.

' of Fig. l, through the dotted line (o0-) (ac-fn).

Fig. 3 is an enlarged sectional View, through the same line, showingparticularly the construction of the adjustable head, the drill-chuckand a portion of the body-piece, Within which the main-shaft shown inFig; 2 is fastened. Fig. 4 is a sectional View of the intermediatebeveled gear-wheel, shown in Fig. 5, through the line (X) (X). Fig. 5 isa ,top view of the said intermediate beveled `shaft and drill shaft areretained in a rigid position for the purpose of removing or replacing adrill.

Similarlettersrefertosimilarpartsthroughout the several drawings. Thehand-piece proper herein consists o the body-piece (A) and theshell-piece or covering (V), which pieces in combination form thejournals or bearings (by means of the central bore thereof) for the mainor drivingshaft (N), which is attached to any ordinary dental engineflexible shaft. The said shell piece (V) is fastened to and retained-in'it-s proper place on the said bodypiece (A) by the screws (g) (g).The said shell piece (V) has the brake-sleeve or collar (W), directlybeneath which is the longitudinal slot (N), within which is the slidinglug (X), which is attached to and controlled by the said slidingbrake-collar; loosely encircling the said mainshaft (N) at this point isthe notched sleeve (Z),`into which the pins of the lug (X) engage, andhence? is controlled by the same; the said notches of'y the said collar,when it is desired to apply'the brake, by moving the brake collar (W)engage with apin (c) of the collar (a),which is rigidlyfastened to themainshaft by the set-screw (b),and hence revolves with it. By this meansthe rotation of the said mainshaft is controlled by the said collar(W).- The said bodypiece (A) heretofore referred to, has its centralbore of sufficient size to permit the introduction of the drivinggearwheel (M) which is rigidly fastened to the main driving shaft (N)near its extremity, by the lug or pin (0); at the end of said bore is asmaller bore of proper size to form a bearing for the end of -the saidmain driving-shaft ICC of .the `main driving shaft (N).

the said mainshaft Yis amply journaled'` throughout its length, andlongitudinal displacement avoided. The body-piece (A) is encircled bythe collar (T), which said collar carries the push-bar (S),fastened toit by the screw (h), the purpose of which pushbar will v Within saidcollar be explained farther on. and bearing against a shoulder thereofand against the smaller collar (U) is the spring (t) which tends toforce the said collar and pushbar in a direction away from theshellpiece (V) heretofore referred to. The particular feature of thebodypiece (A), however, is the enlarged circular head, integraltherewith, vand adjacent to which is located the `driving gear wheel (M)nearthe inner end This circular head is centrally boredlat right-anglesto the longitudinal bore of the bodypiece to form a bearing `for ftheretention and rotation of the drill-headhereinaftcr referred to, andlike- -Wise vhas a circular recess for the lpurpose of retaining in itsproper position of engagement with the driving gear wheel(M) theintermediate gearwheel (F). v

The rotating head (B) has the lug or stud thecenterof which `is boredand internally` threaded for the reception of `the screw,(-E)

whichsaidlug.protrudes through the circular 'bore of the bodypiece (A)before referredto,

`andrforms-the axis upon which the head rotates; it also forms thebearing for the intermediate gear wheel (F). The said head (B) `hasacircularslot in its side adjacent to thev lower end of the circularhead of the bodypiece ,`and forms with the circular slot therein, anannular groove wherein is seatedthe .fgear-wheelm), having its bearingon said lug oristud and ,in engagement withthe gears (M) and (J),mounted respectively on the shafts (N) and (G). The lug of the rotatinghead (B) protruding through the bodypiece (A) is encircledbylthe notchedwasher (D) to which it is iirmly `fastened by the screw (E). It ywillithus Vbe seen that the washer rotateswith the said rotating head, andthat the push-bar(S) heretofore referred to engaging in the notches:thereof will retain the said rotating head in anyzdesired position, to.changewhich positionit is only necessary to slip back the collar (T),thereby `disengaging the notched washer, whereupon the head may beplaced in anydesired position and thepushbarreleased, thereby lockingthe head in the de- ;siredposition. It will also be seen thatwhateverthe position of the drill-head may be, the

The Vcollar (K) then slips over the hub of the l drill driving shaft (G)lling up the recess within which the cap (L) retains the wholemechanism. `It will thus be seen, that the drill driving gearwheel (J)is ever retained `in its proper position of engagement with theintermediate driving gearwheel and against the Shoulder-and .les ef thedrill shaft,-

The drill ell-ek eeneiets Ief the Shaft KG) longitudinally bored to forma sleeve for the drill-shank at one `extremity and at :the otherextremity is counter-bored and internally threaded to receive theSerewitllnwhiell `being screwed inte the eemerzbeere rupee the wedge Rwithin said sleeve. Said sleeyffe `is ofacone shape, the coneterminating in ,a shoulder whieh rests against the Lbeslyref the lielee,rev Itaining the .drill-shaft in A.its proper position.

Eneirellng the :seid ,eenetwllele is leletteslte permit iteebelegeentreeted egeeet the Sides ef the drill, thereby gripping it) :ie theellllek sleevetH-)Vneer the extremity (nearest Athe Ythe cone against.the drill, in mthis manner gripping it `and retaining `it `while (theWedge causes its absolute rotation,the sfide ofthe drill being fittedbetweenthesideofthesaid wedge and that side of the drill shaft or chuck.v i

The peculiar form of theintermediategear wheel F will be noticedparticularly, thecogs orteeth being cut on the sides, `inorder 1toenable the driving and driven gear-Wheels respectively te ,elweyeeperetewlthfeeeelafecility, no matter what `the positionof the drillhead may be.

At the extremityof `the shellkor covering piece (V), is cut athread, Ito(enable the tool to be screwed to the covering cf a `flexibleshaft, forattaching the device herein, to whatsoever engine it is desired to usein operatingit.

The main-shaft (N) may be solderedabrazed or otherwise attached to the1Cable of `anyof `the devices now in common use for thepurpose ofdrivingl dental drills.

The` device herein `termed a brake 11's not intended to either retard orstop the momen tum of the drivingdevice,lbutlisintroduced for thepurpose of y enabling the operator to moreeasily adjust a drill in the"handpiece,

by reason of the drill-driving` shaft being held stationary by thisdevice, and consequently ICO held against rotation, which wouldotherwise result from the turning of the chuckin g screw.

I-Iaving thus described our invention, what we claim, and desire tosecure by Letters Pat-- ent, is-

l. An adjustable angular dental engine handpiece having the body-piece(A) the shell-piece (V); both longitudinallybored for the reception ofthe main driving shaft (N); the main driving shaft (N) Vthe collar (a),rigidly fastened to the mainshaft (N) by screw (b); the brake-collar(IV) the lug (X) working within a slot in the said shell-piece andfastened to the said brake-collar (W) byscrew (w), and the notchedsleeve (Z) encircling mainshaft (N) and engaging With lug (X) andadapted to slide on said'sh'aft to engage said collar (a) and the lug orp in c thereon. All as and for the purposes hereinbefore set forth.

2. An adjustable angular dental engine handpiece having the body-piece(A) bored for the reception of the mainshaft (N) and driving-gearwheel(M), the extremity of the said bore forminga bearing for the said shaft;the main-shaft (N); the collar (e) rigidly fastened to said mainshaft(N) by screw (f),' andthe bushing (d) screwed into the internallythreaded bore of said bodypiece. All as and for the purposeshereinbefore set forth.

3. In an adjustable angular dental engine handpiece, the combinationwith the bodypiece (A) having a longitudinal bore and provided at itsinner end with an enlarged circular head, centrally bored at rightangles to said longitudinal bore, said head having also a circularrecess concentric with its bore, the

` main shaft (N), mounted in the longitudinal bore of the bodypiece, andthe driving gear- Wheel (M) on said shaft, of the rotatable drill head(B) provided with a longitudinal bore and a stud integral therewith,whereby said head is revolubly mounted in the vertical bore of thebodypiece said drill' head being also provided with a circular recessconcentric with its stud to coincide with the recess in the head of thebody-piece, means for retaining the stud in place; the intermediate gearWheel (F) constructed as described, mounted on said stud to have itsseat in the groove of the rotatable head and recess of the circular headof the bodypiecevand in engagement with said drive wheel, the shaft (G)mounted in the bore of the drill-head, the driven vgear wheel (J)mounted thereon in engagement with said wheel (F), and means for rigidlyhaving the longitudinal slits (C) and the slot` (0) and longitudinallybored and internally screw threaded; the wedge (R) within said sleeve;the encircling and cone-contracting sleeve (H) the lug or pin passingthrough the sleeve (H), the slot (G) and the wedge (R); and the chuckingscrew (I), screwed into the threaded longitudinal bore of saiddrill-head (G). All as and for the purposes hereinbefore set forth.

5. In an angular dental engine handpiece, the combination with thelongitudinally bored body-piece (A), provided at its forward end with anenlarged circular head bored at right angles to the main body thereofand having a longitudinal slot in the exterior thereof adjacent to saidhead; a collar (u) secured thereon in rear of said slot; a coiled springsurrounding said bodypiece and bearing against said collar; a slidingring on said collar and provided with a shoulder to engage the spring;apush-bar (S), seated to slide in saidslot and secured to the slidingring at its forward end; of a drill-head provided with a stud projectingat right angles thereto, whereby it is adapted to be rotatably mountedin the bore of the circular head; a notched washer (D), secured on saidstud in normal engagement with the spring-held push-bar, whereby thedrillhead may be held at anj7 desired angle with reference to thebody-piece, as and for the purpose specified.

CHARLES L. EURMAN. GEORGE E. HOLLAND.

Attest:

BENJAMIN KELLOGG, '0. CLARENCE INGLES.

